Fix damage done in r421117: UPDATING entries do not make good `pkg-message'
files, especially when there already is existing `files/pkg-message.in'.
Unfortunately, this now requires port revision bump in all three ports.
Pointy hat to: cem

Update nVidia legacy driver versions to 304.131 and 340.96, respectively,
to gain advantage of added support for X.Org X server ABI 20 (xorg-server
1.18). They also fixed a bug that could cause texture corruption in some
OpenGL applications when video memory is exhausted by a combination of
simultaneously running graphical and compute workloads.
PR: 209027